Z85C3010VSG Datasheet, PDF (23/83 Pages) Zilog, Inc. – CMOS SCC Serial Communications Controller

CMOS SCC Serial Communications Controller
Product Specification
15
Functional Descriptions
The architecture of the SCC device functions as:
• A data communications device which transmits and receives data in various protocols
• A microprocessor peripheral in which the SCC offers valuable features such as vec-
tored interrupts and DMA support
The SCC’s peripheral and data communication features are described in the following sec-
tions.
Figure 1 on page 4 shows a SCC block diagram; Figures 6 and 7 show the details of the
communication between the receive and transmit logic to the system bus. The features and
data path for each of the SCC’s A and B channels are identical.
Internal Data Bus
WR7
WR6
SYNC Register ^{SYNC Register}
WRB
20-Bit TX Shift Register
TX Buffer
1 Byte
To Other Channel
Internal TXD
Final TX
MUX
TXD
Zero Insert
(5 Bits)
Sync
Sync
SDLC
Transmit
MUX & 2-Bit
Delay
NRZ
Encode
CRC-Gen
From Receiver
Transmit Clock
Figure 6. SCC Transmit Data Path
PS011707-1013
Functional Descriptions